gtags-cscope • man page

gtags-cscope • man page

gtags-cscope (1)

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NAME

gtags-cscope - interactively examine a C program

SYNOPSIS

gtags-cscope [-bCdehLlVv][-F file ][-012345678 pattern][-p n]

DESCRIPTION

gtags-cscope is an interactive, screen-oriented tool that allows the user to
browse through source files for specified elements of code.

gtags-cscope builds the symbol cross-reference the first time it is used on
the source files for the program being browsed. On a subsequent invocation,
gtags-cscope rebuilds the cross-reference only if a source file
has changed or the list of source files is different. When the
cross-reference is rebuilt, it is updated incrementally, which makes rebuilding faster
than the initial build.

gtags-cscope is a tool which just borrows user interface of cscope; it is GLOBAL
itself for the substance.

OPTIONS

Some command line arguments can only occur as the only argument in
the execution of gtags-cscope. They cause the program to just print out
some output and exit immediately:

-h

View the long usage help display.

-V

Print the version number of gtags-cscope.

--help

Same as -h

--version

Same as -V

The following options can appear in any combination:

-a

Print absolute path names.

-b

Build the cross-reference only.

-C

Ignore letter case when searching.

-d

Do not update the cross-reference.

-e

Suppress the '^e' command prompt between files.

-Ffile

Read symbol reference lines from file.
(A symbol reference file is created by > and >>,
and can also be read using the < command,
described under ``Issuing Subsequent Requests'', below.)

-i

Ignore SIGINT signal in line-oriented mode.

-L

Do a single search with line-oriented output when used with the
-num pattern option.

-l

Line-oriented interface.
This option implies the -d option.

-[0-9]pattern

Go to input field num (counting from 0) and find pattern.

-pn

Display the last n file path components instead of
the default (1). Use '0' to not display the file name at all.

-v

Be more verbose in line-oriented mode.

Requesting the initial search

After the cross-reference is ready, gtags-cscope will display this menu:

Find this symbol:
Find this function definition:
Find functions called by this function (N/A):
Find references of this function:
Find this text string:
Change this text string:
Find this egrep pattern:
Find this file:
Find files #including this file:

Press the <Up> or <Down> keys repeatedly to move to the desired input
field, type the text to search for, and then press the <Return> key.

Issuing subsequent requests

If the search is successful, any of these single-character commands
can be used:

0-9a-zA-Z

Edit the file referenced by the given line number.

<Space>

Display next set of matching lines.

<Tab>

Alternate between the menu and the list of matching lines

<Up>

Move to the previous menu item (if the cursor is in the menu)
or move to the previous matching line (if the cursor is in the
matching line list).

<Down>

Move to the next menu item (if the cursor is in the menu)
or move to the next matching line (if the cursor is in the
matching line list).

+

Display next set of matching lines.

-

Display previous set of matching lines.

^e

Edit displayed files in order.

>

Write the displayed list of lines to a file.

>>

Append the displayed list of lines to a file.

<

Read lines from a file that is in symbol reference format
(created by '>' or '>>'), just like the -F option.

^

Filter all lines through a shell command and display the
resulting lines, replacing the lines that were already there.

|

Pipe all lines to a shell command and display them without
changing them.

NOTE: If the first character of the text to be searched for matches
one of the above commands, escape it by typing a '\' (backslash) first.

Substituting new text for old text

After the text to be changed has been typed, gtags-cscope will prompt for
the new text, and then it will display the lines containing the old
text. Select the lines to be changed with these single-character
commands:

0-9a-zA-Z

Mark or unmark the line to be changed.

*

Mark or unmark all displayed lines to be changed.

<Space>

Display next set of lines.

+

Display next set of lines.

-

Display previous set of lines.

^a

Mark or unmark all lines to be changed.

^d

Change the marked lines and exit.

<Esc>

Exit without changing the marked lines.

!

Start an interactive shell (type '^d' to return to gtags-cscope).

^l

Redraw the screen.

?

Give help information about gtags-cscope commands.

Special keys

If your terminal has arrow keys that work in vi, you can use them
to move around the input fields. The up-arrow key is useful to move to
the previous
input field instead of using the <Tab> key repeatedly. If you have
<CLEAR>, <NEXT>, or <PREV> keys they will act as the '^l', '+',
and '-' commands, respectively.

Line-Oriented interface

The -l option lets you use gtags-cscope
where a screen-oriented interface
would not be useful, for example, from another screen-oriented program.

gtags-cscope will prompt with '>>' when it is ready
for an input line, which starts
with the field number (counting from 0), immediately followed by the
search pattern. For example, '1main' finds the definition of the
'main' function.

If you just want a single search, instead of the -l option use
the -L and -num pattern options,
and you won't get the '>>' prompt.

For -l, gtags-cscope outputs the number of reference lines:
cscope: 2 lines

For each reference found, gtags-cscope outputs a line consisting of the file
name, function name, line number, and line text, separated by spaces.
For example:
main.c main 161 main(argc, argv)

Note that the editor is not called to display a single reference,
unlike the screen-oriented interface.

You can use the 'c' command to toggle ignore/use letter case when
searching. (When ignoring letter case, a search for 'FILE' will
match 'File' and 'file'.)

You can use the 'r' command to rebuild the database.

gtags-cscope will quit when it detects end-of-file, or when the first
character of an input line is '^d' or 'q'.

ENVIRONMENT VARIABLES

The following environment variables are of cscope origin.

CSCOPE_EDITOR

Overrides the EDITOR and VIEWER variables.
Use this if you wish to use a different editor with cscope
than that specified by your EDITOR/VIEWER variables.

CSCOPE_LINEFLAG

Format of the line number flag for your editor.
By default, cscope invokes your editor via the equivalent of
'editor +Nfile', where N is the line number
that the editor should jump to.
This format is used by both emacs and vi.
If your editor needs something different, specify it in this variable,
with '%s' as a placeholder for the line number.
Eg: if your editor needs to be invoked as 'editor -#103 file'
to go to line 103, set this variable to '-#%s'.

CSCOPE_LINEFLAG_AFTER_FILE

Set this variable to 'yes' if your editor needs to be invoked with
the line number option after the filename to be edited. To continue
the example from CSCOPE_LINEFLAG, above: if your editor needs to see
'editor file -#number', set this environment variable.
Users of most standard editors (vi, emacs) do not need
to set this variable.

EDITOR

Preferred editor, which defaults to vi.

HOME

Home directory, which is automatically set at login.

SHELL

Preferred shell, which defaults to sh.

TERM

Terminal type, which must be a screen terminal.

TERMINFO

Terminal information directory full path name. If your terminal
is not in the standard terminfo directory, see curses
and terminfo for how to make your own terminal description.

If this variable is set, '$GTAGSGLOBAL' is used as the name
of global(1). The default is global.

GTAGSGTAGS

If this variable is set, '$GTAGSGTAGS' is used as the name
of gtags(1). The default is gtags.

GTAGSDBPATH

The directory in which the tag files exist.
This value is ignored when GTAGSROOT is not defined.

GTAGSLABEL

Configuration label. The default is 'default'.

GTAGSLIBPATH

If this variable is set, it is used as the path to search
for library functions. If the specified tags is not
found in the project, global also searches in these paths.
Since only 'GTAGS' is targeted in the retrieval, this variable is
ignored when -r or -s is specified.

GTAGSROOT

The root directory of the project.

MAKEOBJDIR

If this variable is set, '$MAKEOBJDIR' is used as the name
of BSD-style objdir. The default is 'obj'.

MAKEOBJDIRPREFIX

If this variable is set, '$MAKEOBJDIRPREFIX' is used as the prefix
of BSD-style objdir. The default is '/usr/obj'.

FILES

'GTAGS'

Tag file for definitions.

'GRTAGS'

Tag file for references.

'GPATH'

Tag file for source files.

'GTAGSROOT'

If environment variable GTAGSROOT is not set
and file 'GTAGSROOT' exists in the same directory as 'GTAGS'
then global sets GTAGSROOT to the contents of the file.

SEE ALSO

BUG

The function field of the display is almost <unknown> since
GLOBAL doesn't recognize it.

'Find functions called by this function' is not implemented.

AUTHOR

Joe Steffen (original author) and others.

HISTORY

Cscope was originally developed at Bell Labs in the early 1980s,
and was released as free software under the BSD license in April 2000.
Gtags-cscope is a derivative of cscope to use GLOBAL
as the back-end.
Its line-oriented interface was originally written in 2006, and was
re-implemented in 2011 using cscope itself.